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	<title>Python 爬虫开发与项目实战</title>
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	Hn 标题标记---->>
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		<h1>Python爬虫</h1>
		<h2>Python爬虫</h2>
		<h3>Python爬虫</h3>
		<h4>Python爬虫</h4>
		<h5>Python爬虫</h5>
		<h6>Python爬虫</h6>
	font 标记---->>
	<font size="1">Python 爬虫</font>
	<font size="3">Python 爬虫</font>
	<font size="7">Python 爬虫</font>
	<font size="7" color="red" face="微软雅黑">Python 爬虫</font>
	<font size="7" color="red" face="宋体">Python 爬虫</font>
	<font size="7" color="red" face="新细明体">Python 爬虫</font>
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	B 标记加粗---->>
	<b>Python 爬虫</b>
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	i 标记斜体---->>
	<i>Python 爬虫</i>
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	sub下标标记---->>
	2<sub>2</sub>
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	sup上标标记---->>
	2<sup>2</sup>
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	引用标记---->
	<cite>Python 爬虫</cite>
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	em标记表示强调，显示为斜体---->>
	<em>Python 爬虫</em>
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	strong标记表示强调，加粗显示---->>
	<strong>Python 爬虫</strong>
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	small标记，可以显示小一号的字体，可以嵌套使用---->>
	<small>Python 爬虫</small>
	<small><small>Python 爬虫</small></small>
	<small><small><small>Python 爬虫</small></small></small>
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	big标记，显示大一号的字体---->>
	<big>Python 爬虫</big>
	<big><big>Python 爬虫</big></big>
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	u标记是显示下划线---->>
	<big><big><big><u>Python 爬虫</u></big></big></big>
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